Overedge-looper mechanism for sewing machines



Nov. 22, 1927.

S. G. TATE OVEREDGE LOOPER MECHANISM FOR SEWING MACHINES Filed July 18,1924 2 Sheets-Sheet 2 & Q Q

v QWW 6 sewing machine.

on a fixed the space between Patented Nov. 22, 1927.

UNITED STATES PATENT OFFICE.

SAMUEL enoaen ra'rnor wasnrnc'ron, DISTRICT or COLUMBIA, ,ASSIGNOR 1T0,

UnIoIv srncrar macnrun' coMraN on CHICAGO, I LIN'oIs, A CORPORATION orILLINOIS.

Application filed July 18,

although more particularly to the over-edge looper mechanism of anover-edge typeof In over-edge sewing machines, such as is shown inPatent 962,974, issued June-28th,. 1910, to Lansing Onderdonk, theoveredge looper is fulcrumed below the throatv plate pivot which islocated to the left of the needle. This overedge looper, c00per-: ateswith the under looper to project a loop of thread upwardly-around theedge of the work to a position above the work, whereby the needle in itsdescent will enter said loop. Not only the timing of these stitchforming instrumentalities,but also the points of cooperation must becertain. For instance, the overedge looper in its ascending movement,must pass the under looper at a fixed point relative to the thread eye.of said under looper, and at the upper end of its movement the overedgelooper must be positioned at a fixed point relative to the-needle,whereby the needle will with certainty enter the. loop of thread carriedupwardlyby said overedge looper. *Therefore, the radius of the overedgelooper must be fiXedand' consequentlythe upper surface of the throatplate and the are prescribed by the overedge looper is limited tosuchancxtent that work of ordinary thickness only can be stitched onsuchmachine- In other words, the stitch forming instrumentalities cannotbe adjusted to create sufiicient space for the passage of heavy sweaterwork or the like, under the overedge looper. F urthermore, by pivotingthe overedge looper at a point to the left of the needle, it is imposesibleto locate a horn atthe left of the needle around which stockingsmay beturned when it is desired to hem the upper portions thereof. I 7One of the important objects of my-invention is, therefore,- to providean overedge looper mechanism by which'the looper will be caused totravel in a path whereby a considerably increased space between theupper surface of'the throat plate and the path of travel of the looperwillbe obtained, thus permitting heavy sweater work, or the likc, to bestitched. V v 1 a j Another importantobject of my invention is toprovide in an overedge mechanism OVEREDGE-LOOPER MECHANISM FOR SEWINGMACHINES.

1924, ser al no. 72 ,742.

type describechmeans for varying the path of the looper travel wherebysaid travel may be adjusted'to suit vvarious working conditions. 1

- A still further object of my invention'is to support and actuate theoveredge looper by means located entirely onthe right-handv side of theneedle, thereby positioningof a hornat the le termitting the of theneedle for use in hemming stockings or other small tubular articles.

Theseand other objects will part be obvious and will in part behereinafter more fully described.v i i V In the accompanying drawingswhich illustrate one form of my invention Figure 1 is a front elevation,partly in section, showing the application of my invention;

Fig. 2 is a view showing more or less diagrammatically, the throatplate, the needle, and the co-operating stitch forminginstrumentalities, the needle being at the lower endof thisstroke; and

Fig. 3 is an end. iew of the overedge looper mechanism, parts thereofbeing shown in section. e

Referring to the drawings in detail, 5 des ignates a threat plate orwork support, which is provided with the usual opening through which thethreaded needle 6 reciprocates in a vertical plane. The needle 6 iscarried by needle bar 7 and the latter is reciprocated from an upperrotary shaft 8 through the medium of a lever 9.

Co-operating with the needle 6 below the throat plate is a' threadedunder looper 10 which is mounted in a looper carrier 11 pivoted to themachine frame as at 12, below the throat plate and on the right of theneedle. The carrier is provided with a rock arm which is connected by alink 13'to an arm 14 on the lever9. Thus the rotary shaft oscillates theunder looper back and forth in a single plane, the looper moving in rearofv the needle and toward the right when it enters the needle threadloop, the point of the looper at the end of the looper movement beinglocated a distancewell tolthe right of the right-hand edge of the throatplate 5.

- 'Co-operating with'theunder looper 10 and or a looper of the spreadertype, both forms being recognized this art asbeing 'substr tuted, onefor the other, for the production of either a three-thread or two-threadstitch.

looper to include either type of looper. This overedge looper isremovably mounted in the upper end of a substantially verticallydisposed looper supporting rod 16 Whieh'as supported on the machineframe through the medium of sliding pivot-a1 eenneetien whieh I havedesignated by the numeral 17. This connection comprises a bracket- 18which-1's supported on the machine frame at the right of the throatplate by screws 19-, 19, which pass through slots 20, 20 to permitlateral adjustment of "the bracket. The ti per end of the bracket istor-med with a bearing opening 21, the longitudinal axis being' inclined upwardly from front to rear, journalcd in this hearing is a stud222 --hav'ing an opening-'23 formed in one end thereof receive thelooper supporting rod 16. TlHS opening 23 is preferably tor-med a's-there sult era sleeve 24 which is integral with the stud 22, and thelongitudinal axis of said opening is disposed in a plane at right anglesto the longitudinal a-Xis oil the stud 22. A rock shaft 25 is jou naletlon the machine frame at the right of the bracket 18 and is located belowthe horizontal plane containing the connection 17. Fixed to this shaft25 is a rockarm 2'6 which is wpivoted as at 27, to the lower end of thelooper supporting i'od 1'6. This rock arm 26 is rocked from the mainrotary shaft 8 through the medium o l? a crank and a link29, the latterbeing pivotally connected with the rock arm by a pin and slot connection30 to permit of adju'sfi meat to var the extent of rocking moveme'nt o'tsaid arm. The rock shaft 25 is inclined upwar'dlytrom front't'o rear is"in parallelism with the axisof the stud 22, anti is preferably rockeo adi' st'ance equally above and below a horizontal line passing'throughthe center of the shaft 25.

In operation, as the needle begins to'rise the under ljooper moves tothe right in rear of the needle and enters the needle thread loop. andterminates its right hand movement beyond, that is, at the right of thethroat plate. The ever-edge loop'er then moves upwardly, due to themovement ofthe rock arm, and inasmuch as the pivot connec- 6011 30travels in a substantially stra igli't line until the horizontal isreached, the looper will likewise travel upwardly in substantially astraight line. After the connection reaches "the horizontal, it will "bemoved upwardly towards the ri ht'aad consequently the looper rod 'willbe swung so as to move thelooper upwardly "and towards the left over thefabric and presser foot, to a position in. advance of the needle 6,whereby the latter. which has been rising in the meantime, will with'certaint'yenter the loop of thread carried by said 'overedge looper.

Thus, by this overedge looper mechanism,

the looper is caused to move upwardly for a Therefore, I employ the termeveredge considerable distance above the upper surface of the throatplatebefore it begins'its right of the needle and consequently'ithespace on the left of the needle is clear-for the purpose of providing ahorniabout which stoeki-ngs or other tubular work maybe turned forhemming. or other operations,

Having thus described any invention, what I claim as new and desire tosecure by Letters Patent is: i

In a sewing machine the combination with a Work support, a verticallyreciprocaor the to-ry need-lre, a threaded under 'looper 'c'ooperatingwith the needle below port, and fan everedge looper "co-operating withsaid under looper and needle to posi; than a loop of threadar'oundandabov'e said work support into position to be entered by the needleClui'fllg its descent, means for sup;

porting said overedge looper, and :devices for -1noving said supportingmeans bodily l'oi'igi'tt'rdinally and for swinging said su porting meansabout a fixed center lying in the path othodily whereby said looper ismoved upwardly substantially in a straight line IZ'OHLH gpointgincooperation with the under lo'oper tot a point well above the worksupport and thence laterally and upwardly over the work support to -'apoint on the opposite side of the needle so that the needle c-an enterthe loop carried Toy-said overed ge looper.

2.311 a sewing machine, the combination with a work support, avertically recipro'c'ato'ry. needle, "a threaded under 'l'oop'erco-operatin'g with the needle below the work support, and an overedgelooper *co-op'erat ing'with' s'aid under lo'oper and needle to positionloop of thread around and above said work support into position to beentered by the needle during its descent,- and means for supporting andoperating :said' movement 'ofrth'e l'ooper,

the work sa crating with the needle below the work support, and anoveredge looper co-operating with said under looper and needle toposition a loop of thread around and above said work support intoposition to be entered by the needle during its descent, means for operating said overedge looper comprising a looper supporting rod, apivotal support for said rod in which the'rod slides, a rock arm havinga fixed fulcrum and having its end pivoted to the rod, and means foroscillating said rock arm.

4. In a sewing machine, the combination with a work support, avertically reciprocatory needle, a threaded under looper co-opcratingwith the needle below the work support, and an overedge looperco-operating with said under looper and needle to position a loop ofthread around and above said work supportinto position to be entered bythe needle during its descent, and means-for operating said overedgelooper including an upwardly extending looper supporting rod, a pivotalsupporting connection therefor in which said rod slides, and means for'recip rocating said rod longitudinally through said connection and foroscillating saidrod during said reciprocatio-ns.

5. In a sewing machine, the combination with a work support, avertically reciprocatory needle, a threaded under looper cooperatingwith the needle below the work support, and an overedge looperco-operating with said under looper and needle to position a loop ofthread around and above said work support int-o position to be enteredby the needle during its descent, means for operating said overedgelooper including an upwardly extending looper supporting rod, a pivotalsupporting connection therefor in which said rod slides, and means forreciprocating said rod longitudinally through said connection and foroscillating said rod during said reciprocations, said reciprocatorymeans including a rock arm pivotally connected to said rod and movablefrom a point below to a point above a horizontal line passingthrough thefulcrum of said arm.

6. In a sewing machine, the combination with a Work support, avertically reciprocatory needle, a threaded under looper co- 7operating, with the needle below the work support, and an overedgelooper co-operating with said under looper and needle to ponally'throughsaid connection and for oscillating said rod during said reciprocations,

said sliding pivotal supporting connection comprising a supportingbracket, a stud journaled therein, and provided at one end with avertically extending sleeve for receiving said looper supporting rod.

7. In a sewing machine, the combination with a work support, avertically reciprocatory needle, a threaded under looper co-opcratingwith the needle below the work support, and'an overedge looperco-operating with said under looper and needle to position a loop ofthread around and above said work support into position to be entered bythe needle during its descent, means for operating said overedge looperincluding an upwardly extending looper rod, a pivotal supportingconnection therefor in which said rod slides, and means forreciprocating said rod longitudinally through said connection and foroscillating said rod during said reciprocations, said overedge looperoperating mechanism being entirely located on the right-hand side of theneedle.

8. In a sewing machine, the combination with a work support, avertically reciprocatory needle, a threaded under looper co-opcratingwith the needle below the work support, and an overedge looperco-operating With said under looper and needle to position a loop ofthread around and above said work support into position to be entered bythe needle during its descent, means for operating said overedge looperincluding an upwardly extending looper supporting rod, a laterallyadjustable bracket, a stud journaled therein and provided-with anopening in which the looper supporting rod is free to slide, and meansfor reciprocating said rod longitudinally in said support and foroscillating said rod and the supporting stud thgrefor during thereciprocations of said ro In testimony whereof, I aflix my signature.

, SAMUEL GEORGE TATE.

